The foul smell turned out to be a minor boiler repair
I am aware that any foul smells in the apartment have to be eradicated immediately. I am on it when it comes to vacuuming, mopping, scrubbing, and spraying Febreze in my household. I invested in an air cleaner that installs right into my air duct to remove any mold, mildew, and smelly smells wafting around.